Ozu, Ehime, Japan Historical Air Quality Analysis

Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!

Good

050

Moderate

100

Poor

150

Unhealthy

200

Severe

300

Hazardous

301+

October Air Quality Analysis
Ozu, Ehime, Japan

2021

2022

2023

2024

2025

AQI

Days

Days	2025	2024	2023	2022	2021
Oct. 1	35	42	57	57	34
Oct. 2	53	40	48	56	35
Oct. 3	54	22	53	55	53
Oct. 4	55	26	46	43	51
Oct. 5		26	43	19	38
Oct. 6		43	36	46	42
Oct. 7		24	39	39	51
Oct. 8		25	39	32	54
Oct. 9		30	34	36	45
Oct. 10		31	32	32	34
Oct. 11		33	42	32	30
Oct. 12		37	45	29	43
Oct. 13		36	42	49	50
Oct. 14		38	39	45	46
Oct. 15		30	50	48	47
Oct. 16		44	54	59	54
Oct. 17		46	47	40	33
Oct. 18		46	59	41	30
Oct. 19		26	72	28	40
Oct. 20		29	61	29	36
Oct. 21		30	49	48	30
Oct. 22		24	49	35	37
Oct. 23		32	48	51	33
Oct. 24		38	53	31	34
Oct. 25		46	42	27	35
Oct. 26		44	49	32	33
Oct. 27		56	60	33	36
Oct. 28		30	44	44	51
Oct. 29		32	41	34	35
Oct. 30		25	48	36	39
Oct. 31		30	49	45	35

AQI Trends: Highest and Lowest

Highest AQI recorded on

19th Oct 2023

72AQI

Lowest AQI recorded on

5th Oct 2022

19AQI

Same Day Analysis (4th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 55 of Moderate air quality on the same day.

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
Ozu, Ehime, Japan

AQI

Day

Night

5 AM4th Oct 2025

6 PM

4 AM5th Oct 2025

Day time

Avg. Highest Time

8AM4th Oct

65AQI

Avg. Lowest Time

12PM4th Oct

56AQI

Night time

Avg. Highest Time

5AM4th Oct

64AQI

Avg. Lowest Time

2AM5th Oct

55AQI

In the last 24 hours,

Ozu's AQI reached its highest point of 65 at 8 AM during the Day, while the lowest point, 55, was recorded at 2 AM during the Night between 4th Oct and 5th Oct 2025.

Day & Night AQI Trend : Sep - Oct 2025
Ozu, Ehime, Japan

SepOct

05th - 06th06th - 07th07th - 08th08th - 09th09th - 10th10th - 11th11th - 12th12th - 13th13th - 14th14th - 15th15th - 16th16th - 17th17th - 18th18th - 19th19th - 20th20th - 21st21st - 22nd22nd - 23rd23rd - 24th24th - 25th25th - 26th26th - 27th27th - 28th28th - 29th29th - 30th30th - 01st01st - 02nd02nd - 03rd03rd - 04th04th - 05th05th

Day

Night

26°C23/30°C

26°C22/30°C

27°C24/31°C

26°C23/30°C

26°C23/31°C

25°C22/29°C

23°C20/27°C

25°C21/29°C

26°C23/31°C

26°C23/30°C

26°C23/31°C

26°C23/30°C

25°C21/28°C

23°C20/27°C

24°C21/28°C

24°C20/28°C

22°C19/28°C

22°C19/25°C

24°C20/28°C

25°C23/27°C

24°C22/28°C

23°C20/27°C

23°C20/26°C

22°C17/27°C

20°C15/25°C

21°C18/26°C

19°C16/22°C

23°C19/27°C

5 AM

11 AM

6 PM

11 PM

4 AM

--°C/°C

Day time

Avg. Highest Time

10 AM - 6 PM

36AQI

9 hours / Day

270 hours / Month

Avg. Lowest Time

9 AM

32AQI

1 hours / Day

30 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 10 AM to 6 PM (Avg. 36), while the lowest AQI was between 9 AM to 9 AM (Avg. 32).

Night time

Avg. Highest Time

7 PM - 11 PM

36AQI

5 hours / Day

150 hours / Month

Avg. Lowest Time

12 AM - 4 AM

34AQI

5 hours / Day

150 hours / Month

In the last 30 days, during the daytime, the highest AQI was between 7 PM to 11 PM (Avg. 36), while the lowest AQI was between 12 AM to 4 AM (Avg. 34).

2025 Days Vs Air Quality
Ozu, Ehime, Japan

2025

73%

203

27%

Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)

Good

203 Days

Moderate

74 Days

Poor

0 Days

Unhealthy

0 Days

Severe

0 Days

Hazardous

0 Days

Under WHO’s Safe Air Quality Limits: 73%

Health Risk Level:

Low

In 2025, 73% of 278 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.

Annual Air Quality Insights
Ozu, Ehime, Japan

AQI levels in 2025

AQI

PM2.5

PM10

SO2

NO2

Sun.Mon.Tue.Wed.Thu.Fri.Sat.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

41AQI

52AQI

45AQI

44AQI

47AQI

51AQI

45AQI

32AQI

49AQI

No. of days

Jan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.Total Days

202544AQI

203

Highest AQI recorded in

March

52AQI

Lowest AQI recorded in

September

32AQI

202441AQI

280

Highest AQI recorded in

April

56AQI

Lowest AQI recorded in

December

32AQI

202348AQI

232

130

Highest AQI recorded in

June

57AQI

Lowest AQI recorded in

February

41AQI

202247AQI

205

113

Highest AQI recorded in

May

59AQI

Lowest AQI recorded in

August

23AQI

202145AQI

248

100

Highest AQI recorded in

June

58AQI

Lowest AQI recorded in

January

37AQI

202040AQI

197

Highest AQI recorded in

August

57AQI

Lowest AQI recorded in

October

33AQI

Most & Least Polluted Years Over the Last 6 Years

Most Polluted Year Recorded

2023(Avg.)

48AQI

Least Polluted Year Recorded

2020(Avg.)

40AQI

Ozu's annual 2025 AQI (44) shows an average percentage change of 0.4% (worsened AQI) compared to previous years: 2020 (40), 2021 (45), 2022 (47), 2023 (48), 2024 (41).


5 AM	64
6 AM	63
7 AM	63
8 AM	65
9 AM	62
10 AM	58
11 AM	57
12 PM	56
1 PM	57
2 PM	62
3 PM	65
4 PM	61
5 PM	60
6 PM	59
7 PM	56
8 PM	59
9 PM	58
10 PM	58
11 PM	59
12 AM	58
1 AM	57
2 AM	55
3 AM	60
4 AM	61

Ozu, Ehime, Japan Historical Air Quality Analysis

October Air Quality AnalysisOzu, Ehime, Japan

Day & Night AQI Trend: 4th Oct - 5th Oct 2025Ozu, Ehime, Japan

Day & Night AQI Trend : Sep - Oct 2025Ozu, Ehime, Japan

2025 Days Vs Air Quality Ozu, Ehime, Japan

Annual Air Quality InsightsOzu, Ehime, Japan

AQI levels in 2025

No. of days

October Air Quality Analysis
Ozu, Ehime, Japan

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
Ozu, Ehime, Japan

Day & Night AQI Trend : Sep - Oct 2025
Ozu, Ehime, Japan

2025 Days Vs Air Quality
Ozu, Ehime, Japan

Annual Air Quality Insights
Ozu, Ehime, Japan